Please recommend a classic brother-sister romance novel.

I read it last year. I forgot the name of the novel.
This novel about a brother-sister relationship was very classic. It was very realistic and touching.
The article was written in the first person of the male lead. The general plot was that the male protagonist and the female protagonist met each other through chess. They were ambiguous for a long time. The male protagonist kept asking for further development, but the female protagonist never agreed. She kept struggling to love him, but she had to find a girlfriend for him and set him up with several girls.
I don't really remember the middle part
After suppressing it for a long time, the male and female leads had sex at a resort. That part was beautiful, hehe
The story took place in Beijing.
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This novel should be very popular. This caused everyone to question whether the author was writing about his own experiences. The author seemed to be called Lu something…
If anyone knows about this novel, please let me know. Thank you for your reply.
The article was very long. That's why I didn't read the middle part well. It was written very truthfully and delicately. It was a rare good article...
[The male protagonist is about 20+ years old, and the female protagonist is about 30+ years old. It's not a boring story. This novel has a lot of facts and psychological descriptions.]-------------------------
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Answer 1

I recommend the book,"The Love between a Brother and a Sister is a Big Gamble." The plot is compact and tells the story of the love between a brother and a sister who are 12 years apart. It is touching. Although the age difference was huge, it was not easy for the two of them to love each other. I hope you like this fairy's recommendation. Muah ~😗